02-07-2020 08:05 PM
When I start the computer I get HP logo follow by screen with red box and message: Invalid signature detected. Check Secure Boot Policy in Setup
I click ok and get a blue box:
Boot Device Not Found
Please Install an operating system on your hard disk.
Hard Disk - (3FO)
02-08-2020 06:00 PM
OK. Go into BIOS (F10) and make sure secure boot is enabled.
If it is and still error, try clearing the secure boot keys.
If still no help, then perhaps you have lost the boot partition for some reason.
You may be able to download and create a recovery media USB from here: